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570 [2007/02/19 20:15]
n5na
570 [2018/11/01 00:59] (current)
n5na [Mods & Tips]
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 ===== Description ===== ===== Description =====
 Medium power solid state cw transceiver covering 80 - 10 meters. ​ Double direct conversion receiver. ​ Built-in AC power supply. Medium power solid state cw transceiver covering 80 - 10 meters. ​ Double direct conversion receiver. ​ Built-in AC power supply.
 +
 +===== Reviews =====
 +  *[[http://​www.eham.net/​reviews/​detail/​503|eHam]]
 +  *[[http://​p1k.arrl.org/​cgi-bin/​topdf.cgi?​id=70763&​pub=qst|Product Review, QST, 1977, December]] (Must be an ARRL member and logged in to view.)
 +
 +===== Mods & Tips =====
 +  *[[https://​web.archive.org/​web/​20080402235822/​http://​www.io.com:​80/​~n5fc/​c21_pto.htm|Rebuilding the Century 21 PTO / Vernier]] by N5ESE
 +  *[[570humfix|Hum Fix]]
 +  *[[http://​p1k.arrl.org/​cgi-bin/​topdf.cgi?​id=73688&​pub=qst|Semi-Break-In for the Century 21 - Hints & Kinks, QST, 1979, December]] (Must be an ARRL member and logged in to view.)
 +
 +===== Sales Information =====
 +{{570_01_78.jpg?​100|}}
 +
 +===== Accessories =====
 +  *Keyer Model [[670]]
 +  *Calibrator Model [[276]]
 +  *Crystal for 21.0 - 21.5 MHz Model [[271]]
 +  *Crystal for 28.0 - 28.5 MHz Model [[272]]
 +  *Crystal for 28.5 - 29.0 MHz Model [[273]]
 +  *Digital Mod Kit Model [[274]]
 +  *DC Circuit Breaker Model [[1170]]
  
 ===== Specifications ===== ===== Specifications =====
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   ***Frequency Coverage:** 3.5 to 4.0; 7.0 to 7.5; 14.0 to 14.5; 21.0 to 21.5; 28.0 to 28.5; 28.5 to 29.0 MHz. (Crystal not supplied for 28.5 to 29.0 MHz, but available as accessory, Model [[273]].) Note - Early models only included crystals for 3.5, 7, and 14 MHz bands. Crystals for 21 Mhz and 28 Mhz bands were available as optional Models numbers [[271]] and [[272]].   ***Frequency Coverage:** 3.5 to 4.0; 7.0 to 7.5; 14.0 to 14.5; 21.0 to 21.5; 28.0 to 28.5; 28.5 to 29.0 MHz. (Crystal not supplied for 28.5 to 29.0 MHz, but available as accessory, Model [[273]].) Note - Early models only included crystals for 3.5, 7, and 14 MHz bands. Crystals for 21 Mhz and 28 Mhz bands were available as optional Models numbers [[271]] and [[272]].
   ***VFO Frequency Stability:​** less than 20 Hz change per degree Fahrenheit, averaged over a 40<​sup>​o</​sup>​ change from 70<​sup>​o</​sup>​ to 110<​sup>​o</​sup>,​ after 30 minute warmup. ​ Less than 20 Hz change from 105 to 125 VAC line voltage.   ***VFO Frequency Stability:​** less than 20 Hz change per degree Fahrenheit, averaged over a 40<​sup>​o</​sup>​ change from 70<​sup>​o</​sup>​ to 110<​sup>​o</​sup>,​ after 30 minute warmup. ​ Less than 20 Hz change from 105 to 125 VAC line voltage.
 +  ***Direct Frequency Readout:** Marked in 5 kHz increments from 0 - 500 kHz, MHz markings for each band displayed.
   ***Tuning Rate:** Approximately 17 kHz per revolution of main tuning knob.   ***Tuning Rate:** Approximately 17 kHz per revolution of main tuning knob.
   ***Power Requirements:​** 105 - 125 VAC, 50-60 Hz.  10 watts receive, 100 watts transmit.   ***Power Requirements:​** 105 - 125 VAC, 50-60 Hz.  10 watts receive, 100 watts transmit.

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